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I have a Mac Mini running 10.5.8 and the display suddenly went dim. It doesn't look like it is a monitor issue or the USB to VGA adapter. The monitor is extremely dim and I can barely make things out. I have tried changing the Display profile and changing out the USB to VGA adapter.

Well, if you have a known good monitor that you can switch it out with, than I would do that first. That way you can say, the monitor isn't it for sure. From there you can try switching out cables, and work your way back. Also on your apple keyboard there is a dim and brighten button, you might want to try that first.(F1 and F2)